| 引用本文: | 朱守中,柳征,姜文利.基于能量度量的星载AIS信号自适应码元同步抽取算法.[J].国防科技大学学报,2012,34(5):73-77.[点击复制] |
| ZHU Shouzhong,LIU Zheng,JIANG Wenli.Self-adapting arithmetic of decimation and synchronisation of space-based AIS signals based on energy measurement[J].Journal of National University of Defense Technology,2012,34(5):73-77[点击复制] |
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| 基于能量度量的星载AIS信号自适应码元同步抽取算法 |
| 朱守中, 柳征, 姜文利 |
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(国防科技大学 电子科学与工程学院, 湖南 长沙 410073)
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| 摘要: |
| 基带信号码元同步抽取是目前星载 AIS(Automatic Identification System)信号处理中的一个难点问题，针对过零检测和迟门早门等现有算法存在的不足，提出了基于能量度量的基带信号自适应码元同步抽取算法。将基带信号根据采样率和码速率的比值分割成相同的段的组合，之后分别计算每个段内相应样点的能量度量，最后选择使能量度量最大时的样点集作为最优同步抽取样点，该样点集具有最大信噪比。仿真结果验证了该算法误码率优于过零检测和迟门早门算法。 |
| 关键词: 星载 AIS 能量度量 同步抽取 误码率 |
| DOI： |
| 投稿日期：2012-01-12 |
| 基金项目:国家部委资助项目 |
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| Self-adapting arithmetic of decimation and synchronisation of space-based AIS signals based on energy measurement |
| ZHU Shouzhong, LIU Zheng, JIANG Wenli |
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(College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073，China)
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| Abstract: |
| The arithmetic of decimation and synchronisation of Base-band signal is a key problem in space-based AIS(Automatic Identification System) processing. Aiming at the defect of the Detection of Striding across Zero and the Early-late Gate, a method to decimate and synchronise the base band signal based on energy measurement was proposed. We divided the base-band signal into segments with the same length according the rate of sampling and the rate of code, and then we calculated the measurement of corresponding sampling point of every segment. Finally we chose the sequence number of the maximum energy measurement as the best decimation and synchronisation sampling point, which has the character of maximum SNR. Numerical performance of the proposed methods performs better than the existing ones. |
| Keywords: space-based AIS energy measurement decimation and synchronization bit error rate |
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